Answer:
D -- repetitive motion is the correct answer.
Step-by-step explanation:
repetitive motion causes chronic strains.
Chronic strains are the result of repetitive motions of the muscles, tendons, over-use of muscles over a prolonged period.
A strain is caused by bending or twisting a muscle and tendon.
Strains are of two types
- Acute strains: are caused by lifting the heavy objects improperly and by over stressing muscle.
- Chronic strain: caused by repetitive movement of tendons and muscles.